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Hi,
I noticed Okular does not cover the wibox. I removed the titlebar thinking it was bug FS#606 but it is not. Presentation does not expand to the full screen even when wibox is not visible (visible = false). The xprop and xwininfo are attached, maybe Uli sees something.

Hey Uli,
something you said got me thinking... about the window being above - that is thanks to a piece of code I use to keep all floaters above (yes, it happens without that code too). But then I realized I always tried this with Okular floating (I read on tag 9, floating tag).

Now I tried it on a tile layout and it did cover the wibox. Can you try on a floating layout?

Yes, because it turns out this is after all a duplicate of FS#606 - I have another piece of custom code that adds a titlebar to every floating client. Somehow when presentation mode is enabled Okular sends some hint or something and triggers the titlebar adding, the titlebar does not get displayed (this my initial confusion) but the bug 606 is triggered.